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Schedule III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule III        
Encumbrances $ 2,488,259      
Initial Cost to Company, Land and Improvements 1,437,595      
Initial Cost to Company, Buildings and Improvements 2,656,863      
Cost Capitalized Subsequent to Acquisition 2,215,903      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 1,440,188      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,870,173      
Gross Amounts at Which Carried at Close of Period, Total 6,310,361 $ 6,074,516 $ 5,943,970 $ 5,895,953
Accumulated Depreciation and Amortization $ 1,368,012 $ 1,232,699 $ 1,119,612 $ 1,086,844
Life of lease 40 years      
Income tax basis difference $ 297,000      
Operating Real Estate        
Schedule III        
Encumbrances 2,488,259      
Initial Cost to Company, Land and Improvements 1,333,122      
Initial Cost to Company, Buildings and Improvements 2,656,808      
Cost Capitalized Subsequent to Acquisition 2,246,546      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 1,378,218      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,858,258      
Gross Amounts at Which Carried at Close of Period, Total 6,236,476      
Accumulated Depreciation and Amortization 1,368,003      
Operating Real Estate | Universal Buildings, Washington DC        
Schedule III        
Initial Cost to Company, Land and Improvements 69,393      
Initial Cost to Company, Buildings and Improvements 143,320      
Cost Capitalized Subsequent to Acquisition 13,557      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 68,612      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 157,658      
Gross Amounts at Which Carried at Close of Period, Total 226,270      
Accumulated Depreciation and Amortization $ 61,799      
Date of Construction 1956      
Date Acquired 2007      
Operating Real Estate | 2101 L Street        
Schedule III        
Encumbrances $ 127,576      
Initial Cost to Company, Land and Improvements 32,815      
Initial Cost to Company, Buildings and Improvements 51,642      
Cost Capitalized Subsequent to Acquisition 93,454      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 39,768      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 138,143      
Gross Amounts at Which Carried at Close of Period, Total 177,911      
Accumulated Depreciation and Amortization $ 50,779      
Date of Construction 1975      
Date Acquired 2003      
Operating Real Estate | 1730 M Street        
Schedule III        
Encumbrances $ 47,500      
Initial Cost to Company, Land and Improvements 10,095      
Initial Cost to Company, Buildings and Improvements 17,541      
Cost Capitalized Subsequent to Acquisition 19,902      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 10,687      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 36,851      
Gross Amounts at Which Carried at Close of Period, Total 47,538      
Accumulated Depreciation and Amortization $ 17,692      
Date of Construction 1964      
Date Acquired 2002      
Operating Real Estate | 1700 M Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 34,178      
Initial Cost to Company, Buildings and Improvements 46,938      
Cost Capitalized Subsequent to Acquisition (26,135)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 54,981      
Gross Amounts at Which Carried at Close of Period, Total $ 54,981      
Date Acquired 2002, 2006      
Operating Real Estate | Courthouse Plaza 1 and 2        
Schedule III        
Initial Cost to Company, Buildings and Improvements $ 105,475      
Cost Capitalized Subsequent to Acquisition 61,132      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 166,607      
Gross Amounts at Which Carried at Close of Period, Total 166,607      
Accumulated Depreciation and Amortization $ 79,032      
Date of Construction 1989      
Date Acquired 2002      
Operating Real Estate | 2121 Crystal Drive        
Schedule III        
Encumbrances $ 131,535      
Initial Cost to Company, Land and Improvements 21,503      
Initial Cost to Company, Buildings and Improvements 87,329      
Cost Capitalized Subsequent to Acquisition 34,817      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 22,855      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 120,794      
Gross Amounts at Which Carried at Close of Period, Total 143,649      
Accumulated Depreciation and Amortization $ 57,235      
Date of Construction 1985      
Date Acquired 2002      
Operating Real Estate | 2345 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 23,126      
Initial Cost to Company, Buildings and Improvements 93,918      
Cost Capitalized Subsequent to Acquisition 60,830      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,165      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 153,709      
Gross Amounts at Which Carried at Close of Period, Total 177,874      
Accumulated Depreciation and Amortization $ 71,931      
Date of Construction 1988      
Date Acquired 2002      
Operating Real Estate | 2231 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 20,611      
Initial Cost to Company, Buildings and Improvements 83,705      
Cost Capitalized Subsequent to Acquisition 26,839      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 21,784      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 109,371      
Gross Amounts at Which Carried at Close of Period, Total 131,155      
Accumulated Depreciation and Amortization $ 54,729      
Date of Construction 1987      
Date Acquired 2002      
Operating Real Estate | 1550 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 22,182      
Initial Cost to Company, Buildings and Improvements 70,525      
Cost Capitalized Subsequent to Acquisition 133,794      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,375      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 202,126      
Gross Amounts at Which Carried at Close of Period, Total 226,501      
Accumulated Depreciation and Amortization $ 53,120      
Date of Construction 1980, 2020      
Date Acquired 2002      
Operating Real Estate | RTC West        
Schedule III        
Encumbrances $ 117,300      
Initial Cost to Company, Land and Improvements 33,220      
Initial Cost to Company, Buildings and Improvements 134,108      
Cost Capitalized Subsequent to Acquisition 21,153      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 33,390      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 155,091      
Gross Amounts at Which Carried at Close of Period, Total 188,481      
Accumulated Depreciation and Amortization $ 29,467      
Date of Construction 1988, 2017      
Date Acquired 2017      
Operating Real Estate | 2011 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 18,940      
Initial Cost to Company, Buildings and Improvements 76,921      
Cost Capitalized Subsequent to Acquisition 47,156      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 19,716      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 123,301      
Gross Amounts at Which Carried at Close of Period, Total 143,017      
Accumulated Depreciation and Amortization $ 58,670      
Date of Construction 1984      
Date Acquired 2002      
Operating Real Estate | 2451 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 11,669      
Initial Cost to Company, Buildings and Improvements 68,047      
Cost Capitalized Subsequent to Acquisition 42,881      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 12,496      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 110,101      
Gross Amounts at Which Carried at Close of Period, Total 122,597      
Accumulated Depreciation and Amortization $ 50,621      
Date of Construction 1990      
Date Acquired 2002      
Operating Real Estate | 1235 S. Clark Street        
Schedule III        
Encumbrances $ 78,000      
Initial Cost to Company, Land and Improvements 15,826      
Initial Cost to Company, Buildings and Improvements 56,090      
Cost Capitalized Subsequent to Acquisition 34,954      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 16,660      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 90,210      
Gross Amounts at Which Carried at Close of Period, Total 106,870      
Accumulated Depreciation and Amortization $ 45,088      
Date of Construction 1981      
Date Acquired 2002      
Operating Real Estate | 241 18th Street S.        
Schedule III        
Initial Cost to Company, Land and Improvements $ 13,867      
Initial Cost to Company, Buildings and Improvements 54,169      
Cost Capitalized Subsequent to Acquisition 53,944      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 17,236      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 104,744      
Gross Amounts at Which Carried at Close of Period, Total 121,980      
Accumulated Depreciation and Amortization $ 45,256      
Date of Construction 1977      
Date Acquired 2002      
Operating Real Estate | 251 18th Street S.        
Schedule III        
Encumbrances $ 34,152      
Initial Cost to Company, Land and Improvements 12,305      
Initial Cost to Company, Buildings and Improvements 49,360      
Cost Capitalized Subsequent to Acquisition 57,178      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 15,509      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 103,334      
Gross Amounts at Which Carried at Close of Period, Total 118,843      
Accumulated Depreciation and Amortization $ 50,177      
Date of Construction 1975      
Date Acquired 2002      
Operating Real Estate | 1215 S. Clark Street        
Schedule III        
Encumbrances $ 105,000      
Initial Cost to Company, Land and Improvements 13,636      
Initial Cost to Company, Buildings and Improvements 48,380      
Cost Capitalized Subsequent to Acquisition 55,558      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 14,338      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 103,236      
Gross Amounts at Which Carried at Close of Period, Total 117,574      
Accumulated Depreciation and Amortization $ 45,990      
Date of Construction 1983      
Date Acquired 2002      
Operating Real Estate | 201 12th Street S.        
Schedule III        
Encumbrances $ 32,728      
Initial Cost to Company, Land and Improvements 8,432      
Initial Cost to Company, Buildings and Improvements 52,750      
Cost Capitalized Subsequent to Acquisition 28,665      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 9,039      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 80,808      
Gross Amounts at Which Carried at Close of Period, Total 89,847      
Accumulated Depreciation and Amortization $ 40,584      
Date of Construction 1987      
Date Acquired 2002      
Operating Real Estate | 800 North Glebe Road        
Schedule III        
Encumbrances $ 107,500      
Initial Cost to Company, Land and Improvements 28,168      
Initial Cost to Company, Buildings and Improvements 140,983      
Cost Capitalized Subsequent to Acquisition 2,364      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 28,168      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 143,347      
Gross Amounts at Which Carried at Close of Period, Total 171,515      
Accumulated Depreciation and Amortization $ 26,065      
Date of Construction 2012      
Date Acquired 2017      
Operating Real Estate | 2200 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 10,136      
Initial Cost to Company, Buildings and Improvements 30,050      
Cost Capitalized Subsequent to Acquisition 36,767      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 10,756      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 66,197      
Gross Amounts at Which Carried at Close of Period, Total 76,953      
Accumulated Depreciation and Amortization $ 25,943      
Date of Construction 1968      
Date Acquired 2002      
Operating Real Estate | A 1225 S. Clark Street        
Schedule III        
Encumbrances $ 85,000      
Initial Cost to Company, Land and Improvements 11,176      
Initial Cost to Company, Buildings and Improvements 43,495      
Cost Capitalized Subsequent to Acquisition 36,405      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 11,758      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 79,318      
Gross Amounts at Which Carried at Close of Period, Total 91,076      
Accumulated Depreciation and Amortization $ 33,827      
Date of Construction 1982      
Date Acquired 2002      
Operating Real Estate | 1901 South Bell Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 11,669      
Initial Cost to Company, Buildings and Improvements 36,918      
Cost Capitalized Subsequent to Acquisition 20,875      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 12,273      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 57,189      
Gross Amounts at Which Carried at Close of Period, Total 69,462      
Accumulated Depreciation and Amortization $ 30,471      
Date of Construction 1968      
Date Acquired 2002      
Operating Real Estate | Crystal City Marriott        
Schedule III        
Initial Cost to Company, Land and Improvements $ 8,000      
Initial Cost to Company, Buildings and Improvements 47,191      
Cost Capitalized Subsequent to Acquisition 23,334      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,050      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 70,475      
Gross Amounts at Which Carried at Close of Period, Total 78,525      
Accumulated Depreciation and Amortization $ 30,424      
Date of Construction 1968      
Date Acquired 2004      
Operating Real Estate | 2100 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 7,957      
Initial Cost to Company, Buildings and Improvements 23,590      
Cost Capitalized Subsequent to Acquisition 9,118      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,496      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 32,169      
Gross Amounts at Which Carried at Close of Period, Total 40,665      
Accumulated Depreciation and Amortization $ 1,497      
Date of Construction 1968      
Date Acquired 2002      
Operating Real Estate | 1800 South Bell Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 9,072      
Initial Cost to Company, Buildings and Improvements 28,702      
Cost Capitalized Subsequent to Acquisition 9,891      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 9,299      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 38,366      
Gross Amounts at Which Carried at Close of Period, Total 47,665      
Accumulated Depreciation and Amortization $ 19,368      
Date of Construction 1969      
Date Acquired 2002      
Operating Real Estate | 200 12th Street S.        
Schedule III        
Encumbrances $ 16,439      
Initial Cost to Company, Land and Improvements 8,016      
Initial Cost to Company, Buildings and Improvements 30,552      
Cost Capitalized Subsequent to Acquisition 20,528      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,434      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 50,662      
Gross Amounts at Which Carried at Close of Period, Total 59,096      
Accumulated Depreciation and Amortization $ 27,581      
Date of Construction 1985      
Date Acquired 2002      
Operating Real Estate | Crystal City Shops at 2100        
Schedule III        
Initial Cost to Company, Land and Improvements $ 4,059      
Initial Cost to Company, Buildings and Improvements 9,309      
Cost Capitalized Subsequent to Acquisition 3,584      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 4,049      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 12,903      
Gross Amounts at Which Carried at Close of Period, Total 16,952      
Accumulated Depreciation and Amortization $ 6,377      
Date of Construction 1968      
Date Acquired 2002      
Operating Real Estate | Crystal Drive Retail        
Schedule III        
Initial Cost to Company, Land and Improvements $ 5,241      
Initial Cost to Company, Buildings and Improvements 20,465      
Cost Capitalized Subsequent to Acquisition 3,306      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 5,401      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 23,611      
Gross Amounts at Which Carried at Close of Period, Total 29,012      
Accumulated Depreciation and Amortization $ 15,035      
Date of Construction 2003      
Date Acquired 2004      
Operating Real Estate | 7200 Wisconsin Avenue        
Schedule III        
Initial Cost to Company, Land and Improvements $ 34,683      
Initial Cost to Company, Buildings and Improvements 92,059      
Cost Capitalized Subsequent to Acquisition (18,210)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 30,447      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 78,085      
Gross Amounts at Which Carried at Close of Period, Total 108,532      
Accumulated Depreciation and Amortization $ 10      
Date of Construction 1986      
Date Acquired 2017      
Operating Real Estate | One Democracy Plaza        
Schedule III        
Initial Cost to Company, Buildings and Improvements $ 33,628      
Cost Capitalized Subsequent to Acquisition (27,353)      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 6,275      
Gross Amounts at Which Carried at Close of Period, Total 6,275      
Accumulated Depreciation and Amortization $ 872      
Date of Construction 1987      
Date Acquired 2002      
Operating Real Estate | 4747 Bethesda Avenue        
Schedule III        
Encumbrances $ 175,000      
Initial Cost to Company, Land and Improvements 31,510      
Initial Cost to Company, Buildings and Improvements 21,870      
Cost Capitalized Subsequent to Acquisition 140,160      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 32,518      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 161,022      
Gross Amounts at Which Carried at Close of Period, Total 193,540      
Accumulated Depreciation and Amortization $ 15,360      
Date of Construction 2016, 2019      
Date Acquired 2017      
Operating Real Estate | 1770 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 10,771      
Initial Cost to Company, Buildings and Improvements 44,276      
Cost Capitalized Subsequent to Acquisition 69,335      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 11,540      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 112,842      
Gross Amounts at Which Carried at Close of Period, Total 124,382      
Accumulated Depreciation and Amortization $ 3,932      
Date of Construction 1980, 2020      
Date Acquired 2002      
Operating Real Estate | 2221 S Clark Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 985      
Initial Cost to Company, Buildings and Improvements 2,704      
Cost Capitalized Subsequent to Acquisition 6,757      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 1,045      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 9,401      
Gross Amounts at Which Carried at Close of Period, Total 10,446      
Accumulated Depreciation and Amortization $ 2,169      
Date of Construction 1964      
Date Acquired 2002      
Operating Real Estate | Fort Totten Square        
Schedule III        
Initial Cost to Company, Land and Improvements $ 24,390      
Initial Cost to Company, Buildings and Improvements 90,404      
Cost Capitalized Subsequent to Acquisition 1,379      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,407      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 91,766      
Gross Amounts at Which Carried at Close of Period, Total 116,173      
Accumulated Depreciation and Amortization $ 16,921      
Date of Construction 2015      
Date Acquired 2017      
Operating Real Estate | West End25        
Schedule III        
Initial Cost to Company, Land and Improvements $ 67,049      
Initial Cost to Company, Buildings and Improvements 5,039      
Cost Capitalized Subsequent to Acquisition 112,656      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 68,343      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 116,401      
Gross Amounts at Which Carried at Close of Period, Total 184,744      
Accumulated Depreciation and Amortization $ 37,156      
Date of Construction 2009      
Date Acquired 2007      
Operating Real Estate | F1RST Residences [Member]        
Schedule III        
Initial Cost to Company, Land and Improvements $ 31,064      
Initial Cost to Company, Buildings and Improvements 133,256      
Cost Capitalized Subsequent to Acquisition 165      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 31,064      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 133,421      
Gross Amounts at Which Carried at Close of Period, Total 164,485      
Accumulated Depreciation and Amortization $ 10,514      
Date of Construction 2017      
Date Acquired 2019      
Operating Real Estate | 1221 Van Street        
Schedule III        
Encumbrances $ 87,253      
Initial Cost to Company, Land and Improvements 27,386      
Initial Cost to Company, Buildings and Improvements 63,775      
Cost Capitalized Subsequent to Acquisition 27,429      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 28,208      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 90,382      
Gross Amounts at Which Carried at Close of Period, Total 118,590      
Accumulated Depreciation and Amortization $ 16,736      
Date of Construction 2018      
Date Acquired 2017      
Operating Real Estate | North End Retail        
Schedule III        
Initial Cost to Company, Land and Improvements $ 5,847      
Initial Cost to Company, Buildings and Improvements 9,333      
Cost Capitalized Subsequent to Acquisition (327)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 5,871      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 8,982      
Gross Amounts at Which Carried at Close of Period, Total 14,853      
Accumulated Depreciation and Amortization $ 1,353      
Date of Construction 2015      
Date Acquired 2017      
Operating Real Estate | River House Apartments        
Schedule III        
Encumbrances $ 307,710      
Initial Cost to Company, Land and Improvements 118,421      
Initial Cost to Company, Buildings and Improvements 125,078      
Cost Capitalized Subsequent to Acquisition 95,346      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 138,994      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 199,851      
Gross Amounts at Which Carried at Close of Period, Total 338,845      
Accumulated Depreciation and Amortization $ 85,421      
Date of Construction 1960      
Date Acquired 2007      
Operating Real Estate | The Bartlett        
Schedule III        
Encumbrances $ 217,453      
Initial Cost to Company, Land and Improvements 41,687      
Cost Capitalized Subsequent to Acquisition 226,547      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 41,901      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 226,333      
Gross Amounts at Which Carried at Close of Period, Total 268,234      
Accumulated Depreciation and Amortization $ 33,545      
Date of Construction 2016      
Date Acquired 2007      
Operating Real Estate | 220 20th Street        
Schedule III        
Encumbrances $ 80,240      
Initial Cost to Company, Land and Improvements 8,434      
Initial Cost to Company, Buildings and Improvements 19,340      
Cost Capitalized Subsequent to Acquisition 102,757      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,917      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 121,614      
Gross Amounts at Which Carried at Close of Period, Total 130,531      
Accumulated Depreciation and Amortization $ 42,021      
Date of Construction 2009      
Date Acquired 2017      
Operating Real Estate | Falkland Chase-South & West        
Schedule III        
Encumbrances $ 37,873      
Initial Cost to Company, Land and Improvements 18,530      
Initial Cost to Company, Buildings and Improvements 44,232      
Cost Capitalized Subsequent to Acquisition 1,703      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 18,662      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 45,803      
Gross Amounts at Which Carried at Close of Period, Total 64,465      
Accumulated Depreciation and Amortization $ 9,295      
Date of Construction 1938      
Date Acquired 2017      
Operating Real Estate | Falkland Chase-North        
Schedule III        
Initial Cost to Company, Land and Improvements $ 9,810      
Initial Cost to Company, Buildings and Improvements 22,706      
Cost Capitalized Subsequent to Acquisition (1,535)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,999      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 21,982      
Gross Amounts at Which Carried at Close of Period, Total 30,981      
Accumulated Depreciation and Amortization $ 4,480      
Date of Construction 1938      
Date Acquired 2017      
Operating Real Estate | West Half        
Schedule III        
Initial Cost to Company, Land and Improvements $ 45,668      
Initial Cost to Company, Buildings and Improvements 17,902      
Cost Capitalized Subsequent to Acquisition 161,432      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 48,899      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 176,103      
Gross Amounts at Which Carried at Close of Period, Total 225,002      
Accumulated Depreciation and Amortization $ 21,967      
Date of Construction 2019      
Date Acquired 2017      
Operating Real Estate | The Wren        
Schedule III        
Initial Cost to Company, Land and Improvements $ 14,306      
Cost Capitalized Subsequent to Acquisition 140,345      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 17,741      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 136,910      
Gross Amounts at Which Carried at Close of Period, Total 154,651      
Accumulated Depreciation and Amortization $ 10,499      
Date of Construction 2020      
Date Acquired 2017      
Operating Real Estate | 900 W Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 21,685      
Initial Cost to Company, Buildings and Improvements 5,162      
Cost Capitalized Subsequent to Acquisition 39,125      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 22,182      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 43,790      
Gross Amounts at Which Carried at Close of Period, Total 65,972      
Accumulated Depreciation and Amortization $ 3,115      
Date of Construction 2020      
Date Acquired 2017      
Operating Real Estate | 901 W Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 25,992      
Initial Cost to Company, Buildings and Improvements 8,790      
Cost Capitalized Subsequent to Acquisition 64,696      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 26,898      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 72,580      
Gross Amounts at Which Carried at Close of Period, Total 99,478      
Accumulated Depreciation and Amortization $ 6,020      
Date of Construction 2020      
Date Acquired 2017      
Operating Real Estate | The Batley        
Schedule III        
Initial Cost to Company, Land and Improvements $ 44,315      
Initial Cost to Company, Buildings and Improvements 158,408      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 44,315      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 158,408      
Gross Amounts at Which Carried at Close of Period, Total 202,723      
Accumulated Depreciation and Amortization $ 677      
Date of Construction 2019      
Date Acquired 2021      
Operating Real Estate | 2221 S Clark Street Residential        
Schedule III        
Initial Cost to Company, Land and Improvements $ 5,200      
Initial Cost to Company, Buildings and Improvements 14,277      
Cost Capitalized Subsequent to Acquisition 35,332      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 5,477      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 49,332      
Gross Amounts at Which Carried at Close of Period, Total 54,809      
Accumulated Depreciation and Amortization $ 11,471      
Date of Construction 1964      
Date Acquired 2002      
Operating Real Estate | A 1900 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 16,811      
Initial Cost to Company, Buildings and Improvements 53,187      
Cost Capitalized Subsequent to Acquisition 58,524      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 128,522      
Gross Amounts at Which Carried at Close of Period, Total $ 128,522      
Date Acquired 2002      
Operating Real Estate | 5 M Street Southwest        
Schedule III        
Initial Cost to Company, Land and Improvements $ 15,550      
Initial Cost to Company, Buildings and Improvements 6,451      
Cost Capitalized Subsequent to Acquisition 4,454      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 12,672      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 13,783      
Gross Amounts at Which Carried at Close of Period, Total 26,455      
Accumulated Depreciation and Amortization $ 1,022      
Date Acquired 2005      
Operating Real Estate | 2000 South Bell Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 3,882      
Initial Cost to Company, Buildings and Improvements 8,805      
Cost Capitalized Subsequent to Acquisition 1,847      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 14,534      
Gross Amounts at Which Carried at Close of Period, Total $ 14,534      
Date Acquired 2002      
Operating Real Estate | 2001 South Bell Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 3,418      
Initial Cost to Company, Buildings and Improvements 7,941      
Cost Capitalized Subsequent to Acquisition 1,647      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 13,006      
Gross Amounts at Which Carried at Close of Period, Total $ 13,006      
Date Acquired 2002      
Operating Real Estate | 223 23rd Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 3,910      
Initial Cost to Company, Buildings and Improvements 6,546      
Cost Capitalized Subsequent to Acquisition 5,388      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 15,844      
Gross Amounts at Which Carried at Close of Period, Total $ 15,844      
Date of Construction 1969      
Date Acquired 2002      
Operating Real Estate | 2250 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 3,974      
Initial Cost to Company, Buildings and Improvements 8,644      
Cost Capitalized Subsequent to Acquisition 7,557      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 20,175      
Gross Amounts at Which Carried at Close of Period, Total $ 20,175      
Date of Construction 1969      
Date Acquired 2002      
Operating Real Estate | Gallaudet Parcel 1-3        
Schedule III        
Cost Capitalized Subsequent to Acquisition $ 7,494      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 7,494      
Gross Amounts at Which Carried at Close of Period, Total $ 7,494      
Date Acquired 2017      
Operating Real Estate | 2525 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 5,086      
Cost Capitalized Subsequent to Acquisition 6,312      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 5,086      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 6,312      
Gross Amounts at Which Carried at Close of Period, Total $ 11,398      
Date Acquired 2002      
Operating Real Estate | 101 12th Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 6,335      
Cost Capitalized Subsequent to Acquisition 4,141      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 6,335      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,141      
Gross Amounts at Which Carried at Close of Period, Total $ 10,476      
Date Acquired 2002      
Operating Real Estate | RTC West Trophy Office        
Schedule III        
Initial Cost to Company, Land and Improvements $ 8,687      
Cost Capitalized Subsequent to Acquisition (475)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 5,596      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 2,616      
Gross Amounts at Which Carried at Close of Period, Total $ 8,212      
Date Acquired 2017      
Operating Real Estate | Future Development Pipeline        
Schedule III        
Initial Cost to Company, Land and Improvements $ 212,444      
Initial Cost to Company, Buildings and Improvements 1,522      
Cost Capitalized Subsequent to Acquisition 35,600      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 219,806      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 29,760      
Gross Amounts at Which Carried at Close of Period, Total 249,566      
Accumulated Depreciation and Amortization $ 195      
Date Acquired various      
Operating Real Estate | Corporation [Member]        
Schedule III        
Encumbrances $ 700,000      
Cost Capitalized Subsequent to Acquisition 10,467      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 10,467      
Gross Amounts at Which Carried at Close of Period, Total 10,467      
Accumulated Depreciation and Amortization $ 4,494      
Date Acquired 2017      
Held-for-Sale | Pen Place - Land Parcel        
Schedule III        
Initial Cost to Company, Land and Improvements $ 104,473      
Initial Cost to Company, Buildings and Improvements 55      
Cost Capitalized Subsequent to Acquisition (30,643)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 61,970      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 11,915      
Gross Amounts at Which Carried at Close of Period, Total 73,885      
Accumulated Depreciation and Amortization $ 9      
Date Acquired 2007